Automatic stop and start for phonographs



P. M. KREE AND F.DAUTEUIL. AUTOMATIC STOP AND START FOR PHONOGRAPHS.

APPLICATION FILED JULY 28.1919.

Patented May 4, 1920.

lNVNTOR ITED STATE-S rAT NT OFFICE.

' PAUL in. KREE AND FERNAND DAUTEUIL, or new YORK, n. Y.

and Startrfor Phonographs; of which the following is va full, clear, andexact description. V

Our invention relates to. a mechanism for automatically starting andstopping the movement of a record and it has reference i moreparticularly to a device comprising an electromagnetic mechanism, thecurrents of which are controlledby the record.

It is also the object 'ofthis invention to provide a device of the classmentioned which can be easily attached to any phonograph on the market,.7

A practical embodiment of our invention is illustrated in theaccompanying drawings forming part of the specification, in whichsimilar characters of reference indicate correspondlngparts in all theviews.

Figure lis a fragmentary top plan view of a phonograph equipped with ourdevice.

Fig. 2 is anaxial section through a phonographequipped with our device.7

. Fig. '3 is a detailed illustration of the electromagnetic control ofthe brake mechanism, and

' Fig. 4 is an electrical diagram showing the circuits of the device. 7

Referring to the drawings 5 is a turn table forming the support for arecord 6. The turn table is providedwith a sleeve 7 which is free toslide axially in the table and which has the necessary means forengaging the driving shaft 8 of the motor 9 of the phonograph. Thesleeve 7 is also free to slide on the driving shaft 8. The end of thesleeve 7 extending into the case'of the phonograph is engaged withaforked end 10 of an arm 11 pivotally mounted within the case of thephonograph, as shown it is being pivoted on the motor 9. A tensionspring 12 is provided at the other end of the arm so that normally theforked end tends to raise the sleeve above the surface of the table 5.The

tensionspring 12 being of such a resistance that the weightof the record6 is sufficient to depress the sleeve into the position shown in Fig. 2,that is, flush with the table.

The forked end of the arm 11 is adapted Specification of Letters Patent.

M. as... and

. suitable member 13.

wire 26 to a source of electricity 27.

AUTOMATIC s'ror AND s'rARrron rHonoGnArns.

Patented -May 4, .1920.-

Application filed ul 28, 1919. Serial No. 313,7521

to engage a stationary contact 13 in its downward movement and close acircuit to electromagnets 14 mounted in a suitable frame 15.. (See Fig.The forked end of the arm 10 is insulated from the sleeve by a Thereturn movement of theforked end 10 of the arm 11 does not close acircuit for an insulating member 16 is provided to prevent contact. Thecircuit being closed .only for a short interval of time-is sufficient toenergize the magnet and operate thev yieldingbarl'? andcause thedisplacement of the bellcrank arm 18 which carriesa brake member 19v(see-Fig. 3) and disengage orfreethe table and allow the motor9 of thephonograph to startthe rotation of the table.

' The displacement of the bell crank lever 18 must only be very slightfor a spring 20 aidsfurthermovement of the lever as soon Theelectromagnets 14 are supplied with current from a battery 21. locatedin a suitable place within the case of thephonograph and connected bywires 22 and 23 as best shown in the diagram in ,Figrk- The record 6carries a metallic segment 24 in proximity of the end of the soundgroove of the record. This segment is grounded by its engagement withthe driving shaft 8 of the motor, the tone arm 25 being mounted on thewooden case of the phonographjwhich is insulated. It is connected bymeans elf a he same source is also connected by a wire 28 to a set ofcoils 29, mounted on the frame 15 to facethe coils 14. Theseelectromagnets influence the yielding bar 17 in a direction opposite tothat of the coils 14.

The metallic needle carried by the stylus bar. coming in contact withthe segment 24 will close the circuit of the source 27 cans ing thevelectromagnets 29fto be energized thereby attracting the bar 17 inconsequence applying the brake against the table 5 and stopping therecord. The brake will remain in engagement with the turn table until anew record or the same record will be replaced onthe table so as tocause an engagement between the forked end 10 with the contact 13tooperate the brake in the maning the segment 24 part or" the needle,While the brake will remain applied against the table 5 under the actionof the spring 20. We claim:

1. In a phonograph having a revolvingtable and a brake mechanism forsame, of a sleeve mounted to move axially 1n the table,

yielding means for resisting the movement.

of the sleeve and so arranged that said yielding means are adapted to bedepresse dwhen a record is placed on the table, electromagneticallyoperable means for operating the brake mechanism to apply or release thesame, and means operable by the movement of the yielding means forcontrolling the circuit to the electromagneticmeans.

2. In a talking machine a turn table hav- 1 mg a sleeve adapted to moveaxially, SfllCl' sleeve having means for engaging the driving shaft ofthe phonograph movement to turn therewith and to slideon said shaft a" I1 V pivotally mounted arm having one end 111: engagement with saidsleeve, a tensionspring associated with the other endof said arm so thatnormally saidarm tends to" 'ing the driving shaft of electromagneticmeans for disengaging the brake from the table, open circuits for saidelectromagnetic means, means movable axially relative to the table forclosing the circuit to the electromag1iets,'means for disengaging thebrake from the table, and means adapted to'be carried by the record and'cobperate'with the needle of the sound box for closing the circuit oftheelectromagnets to bringfthe brake into engagement with the table. 7 VY i 4:. In a phonograph a table mounted to .7

revolve, a sleeve in saidtable mounted to move axially-and having meansfor engagthe motor of vthe phonograph andto slide thereon, yieldingmeansl normallyltending to maintain the sleeve abovethe table saidyielding means being adapted to allow the displacement of said sleevewhen a record isplaced on the 'table, a pair of oppositelydisposed'electromagnets; a; yieldingfibar adapted to be influenced bysald electromagnets, Va-cbrake mechanism for thetable'connected to saidyielding baigan open circuit for oneioiisa id V electromagnets;means forclosing the said cir'cuit operable by the downward movement of thesleeve; wherebyqsaid brake mechanism is operated so as tozrdisengage thetable, an open clrcult for the' iother, electromagnets I andmeansicarried-by' the record and. the

tone arm for closing the circuit to cause said electromagnet to'influence the yielding bar to bring the brakeinto engagement with 1 thetable; V V

' VPAULM. KREE. FERNAND nanrnmn

